Add dap for csharp debug and autocmd to build c# project/solution and text template

lua/lsp/text-template.lua

@@ -0,0 +1,10 @@
+vim.filetype.add({
+    extension = {
+        tt = "tt",
+    },
+})
+
+vim.api.nvim_create_autocmd({ "BufRead", "BufNewFile" }, {
+    pattern = { "*.tt" },
+    command = "setlocal filetype=tt",
+})